package com.saint.netlibrary.utils;

import android.content.Context;
import android.content.SharedPreferences;
import android.text.TextUtils;
import android.util.Log;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.CookieStore;
import java.net.HttpCookie;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Created by 志浩 on 2016/8/22.
 */
public class PersistentCookieStore implements CookieStore {
private static final String LOG_TAG = "PersistentCookieStore";
private static final String COOKIE_PREFS = "CookiePrefsFile";
private static final String COOKIE_NAME_PREFIX = "cookie_";

private final HashMap<String, ConcurrentHashMap<String, HttpCookie>> cookies;
private final SharedPreferences cookiePrefs;

/**
 * Construct a persistent cookie store.
 *
 * @param context Context to attach cookie store to
 */
public PersistentCookieStore(Context context) {
        cookiePrefs = context.getSharedPreferences(COOKIE_PREFS, 0);
        cookies = new HashMap<String, ConcurrentHashMap<String, HttpCookie>>();

        // Load any previously stored cookies into the store
        Map<String, ?> prefsMap = cookiePrefs.getAll();
        for(Map.Entry<String, ?> entry : prefsMap.entrySet()) {
        if (((String)entry.getValue()) != null && !((String)entry.getValue()).startsWith(COOKIE_NAME_PREFIX)) {
        String[] cookieNames = TextUtils.split((String)entry.getValue(), ",");
        for (String name : cookieNames) {
        String encodedCookie = cookiePrefs.getString(COOKIE_NAME_PREFIX + name, null);
        if (encodedCookie != null) {
        HttpCookie decodedCookie = decodeCookie(encodedCookie);
        if (decodedCookie != null) {
        if(!cookies.containsKey(entry.getKey()))
        cookies.put(entry.getKey(), new ConcurrentHashMap<String, HttpCookie>());
        cookies.get(entry.getKey()).put(name, decodedCookie);
        }
        }
        }

        }
        }
        }

@Override
public void add(URI uri, HttpCookie cookie) {

        // Save cookie into local store, or remove if expired
        if (!cookie.hasExpired()) {
        if(!cookies.containsKey(cookie.getDomain()))
        cookies.put(cookie.getDomain(), new ConcurrentHashMap<String, HttpCookie>());
        cookies.get(cookie.getDomain()).put(cookie.getName(), cookie);
        } else {
        if(cookies.containsKey(cookie.getDomain()))
        cookies.get(cookie.getDomain()).remove(cookie.getDomain());
        }

        // Save cookie into persistent store
        SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
        prefsWriter.putString(cookie.getDomain(), TextUtils.join(",", cookies.get(cookie.getDomain()).keySet()));
        prefsWriter.putString(COOKIE_NAME_PREFIX + cookie.getName(), encodeCookie(new SerializableHttpCookie(cookie)));
        prefsWriter.commit();
        }

protected String getCookieToken(URI uri, HttpCookie cookie) {
        return cookie.getName() + cookie.getDomain();
        }

@Override
public List<HttpCookie> get(URI uri) {
        ArrayList<HttpCookie> ret = new ArrayList<HttpCookie>();
        for (String key:cookies.keySet()){
        if (uri.getHost().contains(key)){
        ret.addAll(cookies.get(key).values());
        }
        }
        return ret;
        }

@Override
public boolean removeAll() {
        SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
        prefsWriter.clear();
        prefsWriter.commit();
        cookies.clear();
        return true;
        }


@Override
public boolean remove(URI uri, HttpCookie cookie) {
        String name = getCookieToken(uri, cookie);

        if(cookies.containsKey(uri.getHost()) && cookies.get(uri.getHost()).containsKey(name)) {
        cookies.get(uri.getHost()).remove(name);

        SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
        if(cookiePrefs.contains(COOKIE_NAME_PREFIX + name)) {
        prefsWriter.remove(COOKIE_NAME_PREFIX + name);
        }
        prefsWriter.putString(uri.getHost(), TextUtils.join(",", cookies.get(uri.getHost()).keySet()));
        prefsWriter.commit();

        return true;
        } else {
        return false;
        }
        }

@Override
public List<HttpCookie> getCookies() {
        ArrayList<HttpCookie> ret = new ArrayList<HttpCookie>();
        for (String key : cookies.keySet())
        ret.addAll(cookies.get(key).values());

        return ret;
        }

@Override
public List<URI> getURIs() {
        ArrayList<URI> ret = new ArrayList<URI>();
        for (String key : cookies.keySet())
        try {
        ret.add(new URI(key));
        } catch (URISyntaxException e) {
        e.printStackTrace();
        }

        return ret;
        }

/**
 * Serializes Cookie object into String
 *
 * @param cookie cookie to be encoded, can be null
 * @return cookie encoded as String
 */
protected String encodeCookie(SerializableHttpCookie cookie) {
        if (cookie == null)
        return null;
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
        ObjectOutputStream outputStream = new ObjectOutputStream(os);
        outputStream.writeObject(cookie);
        } catch (IOException e) {
        Log.d(LOG_TAG, "IOException in encodeCookie", e);
        return null;
        }

        return byteArrayToHexString(os.toByteArray());
        }

/**
 * Returns cookie decoded from cookie string
 *
 * @param cookieString string of cookie as returned from http request
 * @return decoded cookie or null if exception occured
 */
protected HttpCookie decodeCookie(String cookieString) {
        byte[] bytes = hexStringToByteArray(cookieString);
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
        HttpCookie cookie = null;
        try {
        ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
        cookie = ((SerializableHttpCookie) objectInputStream.readObject()).getCookie();
        } catch (IOException e) {
        Log.d(LOG_TAG, "IOException in decodeCookie", e);
        } catch (ClassNotFoundException e) {
        Log.d(LOG_TAG, "ClassNotFoundException in decodeCookie", e);
        }

        return cookie;
        }

/**
 * Using some super basic byte array <-> hex conversions so we don't have to rely on any
 * large Base64 libraries. Can be overridden if you like!
 *
 * @param bytes byte array to be converted
 * @return string containing hex values
 */
protected String byteArrayToHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 2);
        for (byte element : bytes) {
        int v = element & 0xff;
        if (v < 16) {
        sb.append('0');
        }
        sb.append(Integer.toHexString(v));
        }
        return sb.toString().toUpperCase(Locale.US);
        }

/**
 * Converts hex values from strings to byte arra
 *
 * @param hexString string of hex-encoded values
 * @return decoded byte array
 */
protected byte[] hexStringToByteArray(String hexString) {
        int len = hexString.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
        data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character.digit(hexString.charAt(i + 1), 16));
        }
        return data;
        }
        }
